Two-needle-sewing-machine attachment



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R M SHARAF TWO-NEEDLE SEWING MACHINE ATTACHMENT Driginal Filed Nov. 18, 1915 epi. 30 new Patented $ept. so, rare. lfilfitil iti RALPH M. SHARAF, OF NEW YORK, N. Y., ASSIGNOR TO B. SP'il-lRAF MACHINE 00., OF BOSTON, MASSACHUSETTS, A CORPORATION UF MASSACHUSETTS.

'lWO-I TEEDLE-SEVVING-MACHINE ATTACHMENT.

Substitute for applications Serial No. 6 2,241, filed November 18, 1915, and Serial No. 323,436, filed September 12, 1919. This application filed. May a, 1920. Serial No. 378,809.

To all whom it may concern: indicate corresponding parts in all the views, 55

Be it known that I, RALPH M. SHARAF, a and in whichcitizen of the United States, and a resident Figure 1 is a front elevation of my imot the city of New York, borough of Manproved controlling means for the needles,

hattan, in the county and State of New one part being broken away to show the de- York, have invented a new and Improved tails of construction; 60 Two-Needle-Sewing-Machine Attachment, of Figure 2 is a side elevation ol one of the which the following is a full, clear, and needle controlling devices; exact description. I Figure 3 is a sim'lar view of the needle The application is a substitute for an apchuck detached from the socket; and

plication filed September 12, 1919, Serial No. Figure 2 is a detail of one of the needle 65 323,4l36, which application was a renewal of chuck sockets. an application filed May 23, 1917, Serial No. The several parts ot the device may be 170,390 substituted for an application filed made of any suitable materials, and the Nov. 18, 1915, Serial No. 62,241, which latrelative sizes and proportions, as well as the ter application was a renewal or an appligeneral design of the mechanism, may be cation filed July 6, 1914, Serial No. 849,17 5, varied to a considerable extent without dosaid last named application being a division parting from the spirit of the invention of an application filed March 26, 1914, hereinafter more fully set forth and specifi- Serial N 0. 827,333. cally claimed.

This invention relates to sewing machines As above premised, this invention involves 75 of the two-needle type adapted for the sewthe means for controlling the operation of ing of lace, bindings, and trimmings, or the needles in such a manner as to cause stitching, and having facilities for stopping either or both of them to stop temporarily the operation of either needle without disand again be started without interfering turbing the operation of the other needle. with the operation of the other parts of the 5 Among the ob ects of the invention, there machine. At 27 I show the sewing machine fore, is to apply to a sewing machine having head to the bottom of which is secured rigasingle reciprocating needle bar, meansto idly in any suitable manner a bracket 28.

secure two needles to the needle bar for the The needle bar 29 reciprocates in the usual making of two rows of stitches simulmanner in the head 27 and freely through taneously, and to provide means of a safe said bracket.

and reliable nature whereby the operator To the lower end of the needle bar is semay stop and start again either needle while cured rigidly, but detachably, by any suitthe needle bar and the other needle secured able means, as by a set screw 29, a needle thereto continue in operation at full speed. holder 30 which accorcingly reciprocates More specifically stated, the control of the with the ne dle bar continually while the needles is such that the operator, by the macaine as a whole is in operation. Said touch of his finger, may stop the operation holder comprises a pair of sockets 31 of 40 of either needle, means being provided to tubular form and with open top.

hold the needle out of operation, leaving Each socket 31 is adapted to hold a needle both hands of the operator free for turning chuck 82, the needle for each chuck being or guiding the cloth and then making it possecured in place therein by means of a set sible for another touch of the finger in the screw 3% or its equivalent.

45 opposite direction to start the needle for The lateral distance between the points or operation again, the other needle being axes of the needles 33 will be arranged in adapted for continuous operation irrespecaccordance with the work to be performed tive of the needle which has. been stopped by the machine, and the bracket with the temporarily. parts associated therwith may readily be 50 The foregoing and many other objects of replaced by a set of wider or narrower size.

the invention will hereinafter be more fully Each of the chucks 32 is of a form to subset forth and claimed and illustrated in the stantially fit the tubular inner portion or" drawings forming a part of this specificathe socket 31, and during ordinary operation in which like characters of reference tion of the sewing machine these chucks are held snugly in said sockets by any suit able means providing for detachment when desired. The securing means shown herein lower end at 36 adjacent the lower end of through a slot 43 the chuck and adapted to snap outwardly into a slot 37 formed in one side of the socket, the point or shoulder of the catch cooperating directly with a shoulder formed at the upper end of the slot 3'? at the top of the socket. The downward movement, therefore, of the needle bar and holder exerts a positive pressure upon the needle chucks forcing the needles through the work. The upward movementof the needle bar and holder causes a positive lifting of the chucks'and needles by contact be tween the bottoms of'the chucks and the bottom plates 39 of the sockets. Each bottom 39 has a hole or notch 39 through which the needle 33 projects. It will he noted, therefore, that when the catch 35 is interlocked with the shoulder 38, the chuck will he held positively in its socket and caused with its needle to recipro ate up and down. with the needle bar.

The upper end of the catch 35 consists of a linger d0, the inner face of which bears against a spring ll mounted within the upper end 42 of the chuck, and said upper end of each chuck adapted to enter the tubular member or sleeve 4-3 of the bracket 28 when the needle bar ascends. During the ordinary operation of the machine these upper ends 42 enter freely into the sleeves 43 which offer. no resistance thereto.

At 14: I show a cam pivoted at 45 at its upper end on the bracket- 28 and held nor mally out of the path of the finger a0 by virtue of a spring 4:6. i l' hen it is desired to stop the operation of either needle, the operator presses a bell crank ll pivoted on a pivot 418 011 the bracket 28, the toe 47 of the bell crank being adapted to bear against the lower end of the cam l i, causing it to swing); inwardly against the tension of the spring 46 and engage the finger 4:0. -'lheiinger 40 projects laterally normally in the side of the sleeve 43, and when the hell crank ll"? is depressed into the full line position at the right of liigure 1, the catch 35 is released from the shoulder 38 and the cam 11% cooperating with the finger 40 holds the chuck with its needle I elevated while allowing the needle bar Q9 ancl holder 30 to reciprocate in the normal manner. The point or too 4;? of the hell crank, passing beyond the dead center, rei ns in the position shown in l igure l, ing the cam and finger together temporarily. l i hile the machine is in operation, the empty socket 31 passing repeatedly over the chuck 32, the handle end of the bell crank 4C7 may be swung upwardly by the operator whenever desired, and this will release the cam i l, thus setting the catch 35 free to be engaged by the shoulder 08, and to renew the connection between the socket and the needle chuck. The device is simple and sure in operation, and adapted to be operated in either direction noiselessly.

Secured preferably to the front face or side of each of the chucks 32 is a thread guide 49 having a vertical eye. The thread guide, therefore, bears a constant fixed rela tion to the chuck and the needle pertaining thereto. It follows, therefore, that the needle being adapted to be stopped in its, elevated position, the thread takerup (not shown) will have no effect upon the thread while the needle is'idl'e, and hence there will be no possibility of the snarling of the thread. The thread, however, will be in position for immediate action when the needle is again connected to the needle bar and holder. The front portion of the socket 231 is slotted, as indicated in the drawings, so as to accommodate the set screw {i l and the thread guide 49 when the chuck is stationary. j

I am aware that sewing machines of a special type have been made heretofore which purport to so control a plurality of needles as to stop either of'them while the other may continue in motion, but such de vices, so far as I am aware, are not attach ments adapted to be connected to any usual or well. known type of machine. I am aware also that it has been proposed heretofore to provide an attachment fora well known or: usual form of needle bar, such attachment providing for a plurality of needles and means for throwing one of them out of position to operate, but the needle thus thrown out of operation con-- tinues to reciprocate with the needle bar with a tendency to snarl the thread as well as endangering the safety of the operator.

I believe it is new with me, therefore, to provide a device in the nature of an attachment adapted for connection to any ordinary or well-known type of sewing machine, the attachment providing means for instantly and safely throwing out of opera tion or returning to operation either needle without stopping the machine or interfering with the regular action of the other needle.

And furtln-uinore, I believe it to be new with me to provide an attachment for the usual single needle bar of an ordinary sew ing machine, of sum a nature that not only may either needle be stopped or started iniilependently of the other, but both needles may he stopped, either simultaneously or otherwise, while the machine and its needle bar may continue operating, for the purpose of adjustment of the work or for any other purpose.

Having thus described my invention, T

claim as new and desire to secure by Letters Patent:

1. In a sewing machine of the class set forth, the combination with a sewing machine head and a single needle bar reciprocating therein, of a needle holder secured to the needle bar and having a pair of socket members with open tops, a bracket secured to the head above the holder having a pair of sleeves in vertical alignment with said sockets, a pair of needle chucks carried by the sockets and means associated with the sleeves to release the chucks from the sockets and hold the chucks and needles out of operation, the operation of the needle bar and holder remaining unaffected.

2. The combination with a sewing machine head and a single needle bar reciprocating therein, of a stationary bracket connected to the head, a needle holder secured rigidly but detachably to the needle bar, a pair of chucks each having a needle adapted to be secured detachably to the needle holder, and means associated with the bracket to release either or both of the chucks and their needles temporarily from the holder while the needle bar continues in operation, whereby either needle may be operated independently of the other or both needles may be held idle simultaneously.

3. In a two-needle sewing machine, the combination with a head and a single needle bar reciprocating therein, of a needle holder comprising a pair of open-topped socket members carried by the needle bar, a pair of independent needles carried by said holder socket members, a bracket secured to the lower end of the head, and independent sets of devices associated with said bracket for controlling the operation of either needle, releasing it from and through the open top t its socket member and securing it to the needle holder while the needle bar and the other needle continue in operation at full speed.

4:. In a two'needle sewing machine, the combination of a stationary fixed bracket, a needle bar reciprocating along said bracket, a needle holder comprising socket members carried rigidly by the needle bar and each having a notched bottom and an open top, a pair of needles, a pair of needle chucks for said needles adapted to be carried upon said socket bottoms with the needles projecting through the notches, and means under the control of the operator associated with said bracket and chucks to cause the chucks either to be held bythe holder for reciprocation by the needle bar or to be withdrawn from the open tops of the sockets and held in a stationary position by the bracket while the needle bar may continue in operation at full speed.

5. In a two needle sewing machine, the

combination with a fixed bracket, and a single needle bar reciprocating along said bracket, of a needle holder secured rigidly to the needle bar, a pair of socket members carried by said holder to secure and carry two independent needles, and a separate means for each needle and carried by a stationary part of the machine so that either needle can be released from its socket member while the needle bar and other needle continues in operation at full speed.

6. A sewing machine having a single needle bar, a plurality of needles, means for connecting said needles individually with said needle bar, means for holding said needles stationary when disconnected from the needle bar, and independent means for controlling the several connecting means, to connect any one needle to the needle bar and to disconnect it from the needle bar and to render all said needles inoperative at the same time.

7. A sewing machine having a reciprocating needle bar, two needles, separate means for coupling said needles with the needle bar, means for holding said needles stationary when uncoupled from the needle bar, and independent individual devices for throwing the respective coupling means out of action, whereby either needle or both needles may be idle and stationary at the same time.

8. A sewing machine provided with a reciprocating needle bar, and a socket member connected therewith, a stationary sleeve in alignment with said socket, a needle chuck adapted to enter said socket and said sleeve, and means for connecting said chuck either with the stationary sleeve or with the re ciprocating socket member.

9. A sewing machine provided with a reciprocating needle bar and a socket member connected therewith, the axis of said socket being parallel to the path of the bar, a stationary sleeve in alignment with said socket, a needle chuck adapted to enter said socket and said sleeve, a device on the chuck for connecting it either with the stationary sleeve or with the reciprocating socket member, and means for controlling the position of said device.

10. A sewing machine having a single needle bar, a plurality of needles, and a mechanism associated with each needle and operable optionally and carried by a stationary part of the machine, so as to operatively connect any one needle to the needle bar and to disconnect it from the needle bar and whereby all of the needles may be rendered inoperative at the same time.

11. A sewing machine having a single needle bar, two needles, a separate means for connecting each needle to the needle bar each of said means including a manually operable element carried by a stationary part of the machine, so that both needles may be disconnected at the same time and either needle et operable manually to disconnect. one of 'disconncted independent of the other needle. the needles from the holder.

' 12. A sewing-machine having a head, a In testimony that I claim the foregoing 1 single needle bar, a needle holder connected as my invention; I have signed my name 5 to the needle barhelow the head, a plurality hereunder.

of needles, a bracket fixed on the underside 1 "of the head, and means carried by the bl'FLCk- RALPH M. SHARAF. 

